September Weather in St-Jean-Port-Joli, Canada

Last updated: June 18, 2025

In St-Jean-Port-Joli, Canada, the average temperature in September is a comfortable 14°C (58°F). Temperatures can vary from a brisk 4°C (39°F) to a warm 25°C (78°F), making it a delightful time to visit. However, be prepared for 85 mm (3.3 in) of precipitation over approximately 12 days, coupled with an average humidity of 81%. Plan accordingly to enjoy all that this beautiful destination has to offer!

September Temperature in St-Jean-Port-Joli

In September in St-Jean-Port-Joli, the average temperature is 14°C (58°F). Maximums can reach 25°C (78°F), and minimums can be as low as 4°C (39°F). This mild climate makes St-Jean-Port-Joli an ideal destination for travelers seeking comfortable weather for their adventures.

September Weather in St-Jean-Port-Joli: Daily Temperature Highs, Lows, and Averages

The chart illustrates September temperature patterns in St-Jean-Port-Joli, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In St-Jean-Port-Joli, September typically has an average temperature of 14°C (58°F), with highs reaching up to 25°C (78°F) and lows dropping to around 4°C (39°F).

Data source: Temperature data for St-Jean-Port-Joli generated using information from the Copernicus Climate Change Service.

September Precipitation in St-Jean-Port-Joli

In St-Jean-Port-Joli in September, the precipitation amount is 85 mm (3.3 in) over a duration of 12 days.

September Precipitation Trends in St-Jean-Port-Joli

The chart displays monthly precipitation patterns in St-Jean-Port-Joli, with values for each month alongside September’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how September’s conditions compare to those of other months. In St-Jean-Port-Joli, September typically receives around 85 mm (3.3 inches) of precipitation spread over approximately 12 days.

Data source: Precipitation data for September generated using information from the Copernicus Climate Change Service.

Choose your preferred precipitation unit

Millimeters (mm) Inches (in)

September Humidity in St-Jean-Port-Joli

In St-Jean-Port-Joli in September, humidity is 81%. With an average temperature of 14°C (58°F), this humidity feels like a warm blanket wrapping around you, making outdoor adventures sticky and challenging, while also providing a lush, vibrant atmosphere perfect for exploring.

September Average Humidity in St-Jean-Port-Joli

This chart illustrates the average monthly humidity levels in St-Jean-Port-Joli, with September’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In September, average humidity in St-Jean-Port-Joli is approximately 81%, offering insight into how humid the weather typically is during this month.

Data source: Humidity data for September generated using information from the Copernicus Climate Change Service.

September UV Index in St-Jean-Port-Joli

In St-Jean-Port-Joli in September, the maximum UV index is 6, which corresponds to a high Exposure Category. The time to burn is approximately 25 minutes. To find the hourly UV index in St-Jean-Port-Joli, you can refer to this Hourly UV Index in St-Jean-Port-Joli.

Maximum UV Index Levels in St-Jean-Port-Joli for September

The chart shows the monthly maximum UV Index (UVI) for St-Jean-Port-Joli in September, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In September, the maximum UV index in St-Jean-Port-Joli typically reaches 6, which falls under the high exposure category.

Data source: St-Jean-Port-Joli September UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

Extreme (11+): Avoid the sun, stay in shade.
Very High (8-10): Limit sun exposure.
High (6-7): Use SPF 30+ and protective clothing.
Moderate (3-5): Midday shade recommended.
Low (0-2): No protection needed.

How September Weather in St-Jean-Port-Joli Compares to Other Months

Weather in St-Jean-Port-Joli varies notably across the year, with each month offering distinct climate conditions. This page compares September’s weather to other months in St-Jean-Port-Joli, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in St-Jean-Port-Joli, showing how September’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
	Temperature	Precipitation	Humidity	UV
January Weather	-10°C (15°F)	90 mm (3.6 inches)	95%	low
February Weather	-9°C (17°F)	82 mm (3.2 inches)	93%	moderate
March Weather	-4°C (25°F)	98 mm (3.9 inches)	90%	moderate
April Weather	2°C (35°F)	138 mm (5.4 inches)	87%	high
May Weather	9°C (48°F)	111 mm (4.4 inches)	79%	very high
June Weather	15°C (60°F)	96 mm (3.8 inches)	73%	very high
July Weather	19°C (66°F)	78 mm (3.1 inches)	81%	very high
August Weather	19°C (66°F)	82 mm (3.2 inches)	81%	very high
September Weather	14°C (58°F)	85 mm (3.3 inches)	81%	high
October Weather	8°C (47°F)	158 mm (6.2 inches)	87%	moderate
November Weather	0°C (32°F)	130 mm (5.1 inches)	89%	moderate
December Weather	-6°C (21°F)	104 mm (4.1 inches)	92%	low